Cite

Diagram of the public surveys in Iowa.

MLA

Office, United States. General Land. Diagram of the Public Surveys in Iowa. U.S. General Land Office, 1866. https://collections.library.yale.edu/catalog/15814634.

APA, 6th edition

Office, U. S. G. L. (1866). Diagram of the public surveys in Iowa. [Maps]. U.S. General Land Office, https://collections.library.yale.edu/catalog/15814634.